Preparation of TiN-PVP/Polymer-Dispersed Liquid Crystal Composite Films and Studies on Electro-Optical Properties and Optical Modulation

ACS Applied Optical Materials Pub Date : 2025-02-22 DOI:10.1021/acsaom.4c0046610.1021/acsaom.4c00466

Zhenlei Zhong, Yuzhen Zhao, Xun Li, Zemin He, Shuqing Wang, Hong Gao*, Zhun Guo, Dong Wang*, Lei Wang and Yi Luan*,

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Abstract

Polymer-dispersed liquid crystals (PDLCs) exhibiting electro-optical (E-O) conversion capabilities facilitate modulation across the ultraviolet (UV) to infrared (IR) spectrum. In this study, a bilayer TiN-PVP/PDLC composite film device was prepared by utilizing commercially available polymers and nanoparticles to enhance UV and IR shielding efficacy. By optimizing the ratio of polymer monomers to liquid crystals within the PDLC layer, superior E-O characteristics were achieved, which were further augmented through the incorporation of a TiN-PVP film. The results showed that the TiN-PVP/PDLC composite films had the maximum contrast ratio when the TiN doping content was 1.5 wt %. Notably, the TiN-PVP/PDLC composite film demonstrated significant thermal and UV shielding performance under IR and UV irradiation, with thermal shielding efficiencies exceeding 60% in both the off and on states, while UV shielding exhibited commendable values of 96.8% and 56.9% in the corresponding states. This facilely synthesized TiN-PVP/PDLC composite film holds significant promise for passive cooling applications in smart window technologies and architectural structures.

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TiN-PVP/聚合物分散液晶复合膜的制备及其电光性能和光调制研究

聚合物分散液晶（pdlc）表现出电光（E-O）转换能力，促进了紫外（UV）到红外（IR）光谱的调制。在本研究中，利用市售聚合物和纳米颗粒制备了双层TiN-PVP/PDLC复合膜器件，以增强其紫外线和红外屏蔽效能。通过优化PDLC层内聚合物单体与液晶的比例，获得了优异的E-O特性，并通过加入TiN-PVP膜进一步增强了E-O特性。结果表明，当TiN掺杂量为1.5 wt %时，TiN- pvp /PDLC复合膜的对比度最大。值得注意的是，TiN-PVP/PDLC复合膜在红外和紫外照射下表现出显著的热屏蔽和紫外屏蔽性能，在关闭和打开状态下的热屏蔽效率均超过60%，而在相应状态下的紫外屏蔽效率分别为96.8%和56.9%。这种易于合成的TiN-PVP/PDLC复合薄膜在智能窗技术和建筑结构的被动冷却应用中具有重要的前景。

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来源期刊

ACS Applied Optical Materials 材料科学-光学材料-

CiteScore

1.10

自引率

0.00%

发文量

期刊介绍： ACS Applied Optical Materials is an international and interdisciplinary forum to publish original experimental and theoretical including simulation and modeling research in optical materials complementing the ACS Applied Materials portfolio. With a focus on innovative applications ACS Applied Optical Materials also complements and expands the scope of existing ACS publications that focus on fundamental aspects of the interaction between light and matter in materials science including ACS Photonics Macromolecules Journal of Physical Chemistry C ACS Nano and Nano Letters.The scope of ACS Applied Optical Materials includes high quality research of an applied nature that integrates knowledge in materials science chemistry physics optical science and engineering.